Question

controlling what enters and leaves the cell in an important function of the
○ cytoplasm
○ plasma membrane
○ nucleus
○ cell wall

Explanation:

The plasma membrane is a selectively - permeable barrier. It controls the movement of substances in and out of the cell, regulating what enters and leaves. The cytoplasm is the jelly - like substance inside the cell where organelles are suspended. The nucleus contains the cell's genetic material. The cell wall provides structural support and protection, but its main function is not controlling the entry and exit of substances.

Answer:

Plasma Membrane